Sync on demand for attachments

Right now Logseq Sync copies all of one’s attachments to the mobile device. Since attachments can be quite large and aren’t always needed on mobile, it would be good if there was an option to change this behavior. Ideally it would sync on demand - for example, only downloading a PDF when the user specifically requests that file. Other options might be to simply turn off attachment sync altogether, or to allow the user some kind of fine-grained control over which attachments get downloaded (perhaps excluding attachments over a certain size, or certain kinds of files).